支座刚度对高铁箱梁结构声辐射影响分析
|
摘要
随着箱梁结构在高速铁路中的广泛应用,其引起的结构振动和噪声问题日益受到关注。以京沪高速铁路32m简支箱梁为研究对象,首先建立高架轨道箱梁结构声学计算模型,通过仿真与实测一1/10缩尺模型对该模型进行验证,再通过建立高速列车-轨道耦合动力学模型计算作用在箱梁结构上的作用力,并以此作为荷载边界条件施加于箱梁有限元模型上,计算箱梁结构的振动响应。最后,将箱梁结构振动响应作为声学边界条件,采用间接边界元法分析支座刚度对箱梁结构声辐射衰减规律的影响。研究结果表明:在3种不同刚度支座条件下,梁体声功率辐射影响主要集中在1 Hz至48 Hz,支座刚度越大,声功率辐射值及峰值越小。箱梁最大声压级主要集中在1 Hz至20 Hz;各场点声压级变化与声功率变化趋势较为接近;3种支座在相同场点的声压级变化趋势较为接近,但支座刚度越大,声压级越小;在同一场点,支座刚度越大,声压级峰值越小。在48 Hz至100 Hz内,支座刚度值对梁体的声功率辐射及场点声压级大小影响不大。
With the wide application of box girder structure in high-speed railway, its vibration and noise problems have been attracting more and more attention. The paper takes a 32 m long simply supported box girder of Beijing-Shanghai high-speed railway as the research object. At first, the model for structure noise calculation of the elevated railway box girder is established, and the model is verified by comparing the simulation results with the measured results of a 1/10 scaled model. Then, high-speed train and rail coupling dynamics model is established and the force acting on the box girder structure is calculated, and applied as the load boundary condition to the box girder finite element model(FEM) to calculate the vibration response. Finally, with the vibration response of the girder as the acoustic boundary condition, the influence of the support stiffness on the sound radiation of the box girder is analyzed by means of the indirect boundary element method(IBEM). The results show that for the 3 different stiffness conditions, effects of the sound power radiation of the girder are mainly concentrated in 1 Hz-48 Hz, The greater the rigidity of the support is, the smaller the acoustic power radiation value and the peak value are. The maximum sound pressure level(SPL) of the box girder is mainly concentrated in 1 Hz-20 Hz.The SPL change tendency of each field point is close to the sound power change tendency. The SPLs of the three supports at the same field point are relatively close. At the same field point, the greater the support stiffness is, the smaller the SPL and its peak value are. In 48 Hz-100 Hz frequency range, the stiffness value has little effect on the field SPL and the acoustic radiation of the girder.
With the wide application of box girder structure in high-speed railway, its vibration and noise problems have been attracting more and more attention. The paper takes a 32 m long simply supported box girder of Beijing-Shanghai high-speed railway as the research object. At first, the model for structure noise calculation of the elevated railway box girder is established, and the model is verified by comparing the simulation results with the measured results of a 1/10 scaled model. Then, high-speed train and rail coupling dynamics model is established and the force acting on the box girder structure is calculated, and applied as the load boundary condition to the box girder finite element model(FEM) to calculate the vibration response. Finally, with the vibration response of the girder as the acoustic boundary condition, the influence of the support stiffness on the sound radiation of the box girder is analyzed by means of the indirect boundary element method(IBEM). The results show that for the 3 different stiffness conditions, effects of the sound power radiation of the girder are mainly concentrated in 1 Hz-48 Hz, The greater the rigidity of the support is, the smaller the acoustic power radiation value and the peak value are. The maximum sound pressure level(SPL) of the box girder is mainly concentrated in 1 Hz-20 Hz.The SPL change tendency of each field point is close to the sound power change tendency. The SPLs of the three supports at the same field point are relatively close. At the same field point, the greater the support stiffness is, the smaller the SPL and its peak value are. In 48 Hz-100 Hz frequency range, the stiffness value has little effect on the field SPL and the acoustic radiation of the girder.
引文
[1]焦大化,钱德生.铁路环境噪声控制[M].北京:中国铁道出版社,1990.
[2]THOMPSON D.Railway noise and vibration-mechanisms,modeling and means of control[M].Elsevier Science,2009:359.
[3]BERGLUNDB,HASSMENP,JOBRFS.Sources and effects of low-frequency noise[J].The Journal of the Acoustical Society of America,1996,99(5):2985-3002.
[4]環境庁大気保全局.低周波音の測定方法に関するマニュアル[Z].東京:環境庁大気保全局,2000.
[5]李小珍,张迅,李亚东.高速铁路简支箱梁结构噪声的边界元方法[J].土木工程学报,2011,44(S1):95-101+185.
[6]张迅,李小珍,刘德军,等.高速铁路32 m简支箱梁声辐射特性研究[J].铁道学报,2012,34(7):96-102.
[7]LI QI,XU YOU LIN,WU DING JUN.Concrete bridgeborne low-frequency noise simulation based on train Track bridge dynamic interaction[J].Journal of Sound and Vibration,2012,331(10):2457-2470.
[8]张鹤,谢旭,山下夫.桥梁交通振动辐射的低频噪声声场分布研究[J].振动工程学报,2010,23(5):514-522.
[9]石广田,杨新文,张小安,等.高铁板式轨道区段箱梁结构噪声辐射分析[J].噪声与振动控制,2015,35(1):160-164.
[10]高飞,夏禾,曹艳梅,等.城市轨道交通高架结构振动与声辐射研究[J].振动与冲击,2012,31(4):72-76.
[11]曾少辉.轨道交通高架箱梁振动特性模型试验研究[D].南昌:华东交通大学,2017.
[2]THOMPSON D.Railway noise and vibration-mechanisms,modeling and means of control[M].Elsevier Science,2009:359.
[3]BERGLUNDB,HASSMENP,JOBRFS.Sources and effects of low-frequency noise[J].The Journal of the Acoustical Society of America,1996,99(5):2985-3002.
[4]環境庁大気保全局.低周波音の測定方法に関するマニュアル[Z].東京:環境庁大気保全局,2000.
[5]李小珍,张迅,李亚东.高速铁路简支箱梁结构噪声的边界元方法[J].土木工程学报,2011,44(S1):95-101+185.
[6]张迅,李小珍,刘德军,等.高速铁路32 m简支箱梁声辐射特性研究[J].铁道学报,2012,34(7):96-102.
[7]LI QI,XU YOU LIN,WU DING JUN.Concrete bridgeborne low-frequency noise simulation based on train Track bridge dynamic interaction[J].Journal of Sound and Vibration,2012,331(10):2457-2470.
[8]张鹤,谢旭,山下夫.桥梁交通振动辐射的低频噪声声场分布研究[J].振动工程学报,2010,23(5):514-522.
[9]石广田,杨新文,张小安,等.高铁板式轨道区段箱梁结构噪声辐射分析[J].噪声与振动控制,2015,35(1):160-164.
[10]高飞,夏禾,曹艳梅,等.城市轨道交通高架结构振动与声辐射研究[J].振动与冲击,2012,31(4):72-76.
[11]曾少辉.轨道交通高架箱梁振动特性模型试验研究[D].南昌:华东交通大学,2017.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |